The short version of Immunomodulatory peptide fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-08-30 and is reviewed periodically as new material appears.
Several factors accelerate degradation: alkaline pH, elevated temperature, exposure to oxidants, and the presence of residual moisture. Deamidation of asparagine residues and oxidation of methionine are the most commonly reported degradation routes. Because the peptide lacks disulfide bonds, it does not undergo the thiol-related aggregation seen in some other biologics, but physical aggregation can still occur at high concentration. Stability data are product-specific, and extrapolating shelf life between formulations is not reliable.
Lyophilized thymosin alpha-1 is generally stored at or below minus twenty degrees Celsius, protected from moisture and light. Short-term handling at ambient temperature is possible for dry powder, but reconstituted solutions degrade faster and are usually kept at two to eight degrees Celsius with a defined expiry of days rather than weeks. Repeated freeze-thaw cycles should be avoided because they promote aggregation and loss of potency. Exact limits depend on the formulation and should follow the supplier's documentation.
Thymosin alpha 1 is approved as a medicine in several countries, including Italy and China, for indications such as chronic hepatitis B and as an immune adjuvant. It is not approved by the United States Food and Drug Administration as a therapeutic product. In research settings the peptide appears in studies of sepsis, vaccine response, and oncology support, often with mixed or inconclusive results. The evidence base is uneven, and reviews note that many trials were small. Regulatory status therefore differs widely between jurisdictions.
Thymosin alpha 1 is a synthetic 28-amino-acid peptide first isolated in 1966 from thymosin fraction 5, a bovine thymus extract. Its chain begins with an acetylated serine residue and ends with asparagine. The native peptide carries a molecular mass near 3,108 daltons. Researchers classify it as an immunomodulatory agent rather than a hormone with a single endocrine target. Early work framed it as a thymus-derived factor that supports T-cell maturation. The synthetic form used in research and clinical products matches the natural sequence.
Immune signaling studies link thymosin alpha 1 to Toll-like receptor pathways, particularly TLR2 and TLR9, on dendritic cells and other antigen-presenting cells. Activation of these receptors promotes maturation of T cells and increases natural killer cell activity. The peptide shifts cytokine output toward a T helper 1 profile, raising interferon gamma and interleukin 2 while modulating interleukin 10. Whether these effects translate into clinical benefit for any specific disease remains a subject of debate. Reported outcomes vary across trials and populations.
| Property | Value | Notes |
|---|---|---|
| Storage temperature, powder | -20 °C or lower | Protect from light and moisture |
| Storage temperature, reconstituted | 2-8 °C | Use within days |
| Purity testing | Reversed-phase HPLC | Separates truncation products |
| Mass confirmation | Mass spectrometry | Detects deamidation and oxidation |
| Common salt forms | Acetate or trifluoroacetate | Affects solubility and weighing |
Practical handling focuses on limiting adsorption and contamination. The peptide dissolves readily in water, and dilute solutions tend to adhere to plastic and glass surfaces, so an inert carrier protein or a defined buffer can reduce losses in laboratory work. Workers also record the counter-ion form, since an acetate or trifluoroacetate salt changes the mass balance of the weighed powder. Documentation of lot number, purity value, and storage history supports reproducibility when results from different laboratories are compared.
Lyophilized material is generally held at reduced temperature to slow degradation, and storage at minus twenty degrees Celsius or lower is common practice for long-term retention. Short-term working portions are often kept between two and eight degrees Celsius. Once dissolved, the peptide is less stable than the dry powder, and repeated freeze-thaw cycles are associated with loss of material and with aggregate formation. Vials are usually allowed to reach room temperature before opening so that condensation does not introduce moisture, and solutions are protected from light where practical.
Identity and purity are assessed mainly by reversed-phase high-performance liquid chromatography, which separates the peptide from closely related impurities and from truncated or oxidized variants. Mass spectrometry supplies the molecular mass and confirms the expected sequence length, while amino acid analysis can be used to check composition. Because the molecule has no chromophore beyond the peptide backbone, ultraviolet detection is typically performed at a low wavelength, where baseline interference from solvents and buffers is a practical concern. Water content and counter-ion content are often reported alongside purity.
20世纪70年代，研究者从胸腺提取物中纯化出多种小肽，Tα1是其中被较早表征的一种。最初的制备依赖组织匀浆和层析步骤，产量低且成分复杂。随着固相肽合成技术成熟，实验室和工业界能够生产与天然序列一致的合成版本。合成肽的纯度可达95%以上，并可通过反相高效液相色谱和质谱进行鉴定。这一转变使研究不再依赖动物胸腺来源。
市售的胸腺素α1通常以冻干粉形式提供，溶解后用于注射。其氨基酸组成包括多个酸性残基，因此在中性pH下带负电荷。该肽可溶于水和生理盐水，但在有机溶剂中溶解度有限。储存条件通常为冻干状态下负20摄氏度，溶解后需冷藏并避免反复冻融。常见的同义词包括胸腺肽α1、thymalfasin和Tα1。
胸腺素α1（thymosin alpha 1，Tα1）是一种由28个氨基酸组成的酸性肽，N端被乙酰化，分子量约为3108道尔顿。该肽最早从牛胸腺组织提取物中分离，属于胸腺素组分5的一个成分。其序列在不同哺乳动物中高度保守，提示其具有基本的生物学功能。名称中的“α1”指其在电泳中的迁移位置，并非表示亚型编号。它既存在于胸腺，也存在于脾脏和淋巴结等免疫组织。
Quantifying thymosin alpha-1 in a sample usually relies on reverse-phase high-performance liquid chromatography. The peptide lacks strong chromophores, so detection often occurs at 214 nm, where the peptide backbone absorbs. Mass spectrometry provides confirmatory identification and can detect sequence variants or truncations. Immunoassays have been used in biological matrices, but they may cross-react with related fragments. For purity assessment, chromatographic peak area gives the main component percentage, while mass accuracy verifies molecular identity.
The lyophilized peptide is generally stable for extended periods when kept cold and dry. Once dissolved, aqueous solutions are less stable; hydrolysis, oxidation, and aggregation can degrade the material. Storage at -20 °C or lower slows these processes. Repeated freeze-thaw cycles are best avoided because they can promote aggregation. The exact shelf life depends on formulation, pH, and concentration, so stability studies are typically performed for each specific product.
Radium's long half-life of 1600 years means that surfaces coated with radium paint, such as watch faces and hands, remain a health hazard long after their useful life is over. There are still millions of luminous radium clock, watch, and compass faces and aircraft instrument dials owned by the public. The case of the "Radium Girls", workers in watch factories in the early 1920s who painted watch faces with radium paint and later contracted fatal cancer through ingesting radium when they pointed their brushes with their lips, increased public awareness of the hazards of radioluminescent materials, and radioactivity in general.
== Mechanism of action == Through recombinant DNA technology, the final lysine and proline residues on the C-terminal end of the B-chain are reversed. This modification does not alter receptor binding, but blocks the formation of insulin dimers and hexamers. This allows larger amounts of active monomeric insulin to be immediately available for postprandial injections.
On September 26, 2020, an event was held in the White House Rose Garden announcing Amy Coney Barrett's nomination to the Supreme Court following the death of Ruth Bader Ginsburg. According to a 2021 book by Trump's Chief of Staff Mark Meadows, hours after the ceremony, Trump tested positive for COVID-19, although a subsequent test returned negative. Meadows recalled that Trump looked "a little tired" and was suspected of having a "slight cold". Trump later traveled in Air Force One to a rally at the Harrisburg International Airport in Pennsylvania, which was attended by thousands. After Trump's diagnosis was made public, Pennsylvania health officials advised attendees to participate in the state's contact tracing program. After returning from Bedminster, Trump received a positive test result on a rapid test and was waiting to get results of a PCR test when he did a live phone interview on Hannity. On October 2, 2020, Trump tweeted that he and his wife Melania Trump had both tested positive for COVID-19, part of a White House outbreak. Later that day, Trump was hospitalized at Walter Reed National Military Medical Center, reportedly due to fever and labored breathing. He was treated with antivirals, an experimental antibody drug (REGN-COV2), and a steroid. He returned to the White House on October 5, still infectious and unwell. In 2021, it was revealed that his condition had been far more serious than he had previously indicated; he had dangerously low blood oxygen levels, a high fever, and lung infiltrates, indicating a severe case of COVID-19.
== Titanium dioxide and zinc oxide nanoparticles in sunscreen == Sunscreens are utilized to secure the skin from the destructive impacts of ultraviolet radiation from the sun. UVB (290-320 nm) together with UVA-2 (320–340 nm) and UVA-1 (340–400 nm) cause organic and metabolic reactions in the skin. Titanium dioxide (TiO2) and zinc oxide (ZnO) minerals are often utilized in sunscreens as inorganic physical sun blockers owing to their absorption of light in the UV range. As TiO2 is proven to be more effective for blocking UVB and ZnO in the UVA range, the mix of these particles guarantees a broad-band UV shield. To solve the cosmetic disadvantage of these opaque sunscreens, TiO2 and ZnO nanoparticles have been used as a replacement for TiO2 and ZnO microparticles. Since the surface area to volume proportion of particles increases as the particle measurement diminishes, nanoparticles (NPs), ie, nano objects with all dimensions in the nanoscale, might be increasingly (bio)reactive than typical mass materials. When particles become smaller than 100 nm, novel optical attributes develop, owing to discrete nature of nanoparticle optical energy levels. Pat et al., for instance, measured a 0.15 eV blue shift for 4.7 nm TiO2 nanoparticles relative to the bulk material counterpart. When particles become smaller than the ideal light dispersing size (roughly half of the wavelength) visible light is transmitted and the particles appear transparent. This phenomenon explains the cosmetically undesired opaqueness of inorganic sunscreens and makes the utilization of NPs monetarily appealing.
== Television == Airwolf Danger Man, (Known as Secret Agent in the United States) I Led Three Lives – The first foray into mass culture dealing with the Cold War. I Spy (1965–68 US television series) Get Smart MacGyver The Man from U.N.C.L.E. Mission: Impossible Quatermass II Several episodes of Star Trek featured a futuristic version of the Cold War, in terms of the United Federation of Planets vs. The Klingon Empire and the Romulan Star Empire, analogs for the United States, the Soviet Union, and the People's Republic of China, respectively. "A Taste of Armageddon" also showed the concept of MAD in a war between opposing sides. Scarecrow and Mrs. King Ivan the Terrible 1976 sitcom The Rocky and Bullwinkle Show 1960s cartoon for children and adults where the villains are Boris and Natasha, who were both parodies of the Soviet spies. The Sandbaggers The Twilight Zone, a number of episodes of which depicted fallout shelters, such as the 1961 episode, The Shelter, produced as a social commentary on the Civil Defense push during the Berlin Crisis of 1961, and the 1987 Ronald Reagan era "Shelter Skelter". Twilight Zone episodes commenting on other aspects of the Cold War, and World Peace include the 1986 A Small Talent for War. The Transformers (TV series), including the fact that the two first seasons take place during the latter years of the Cold War, an episode, Prime Target directly refers to an event of the episode as The highest point of tension between United States and Soviet Union, since the Cuban Missile Crisis.
Sources: en.wikipedia.org
=== Marriage and family === Freeman was married to Jeanette Adair Bradshaw from October 22, 1967, until November 18, 1979. He married Myrna Colley-Lee on June 16, 1984, the couple separated in December 2007 and divorced on September 15, 2010. Freeman has four children: Alfonso, Deena, Morgana, and Saifoulaye. Freeman and Colley-Lee also raised Freeman's step-granddaughter from his first marriage, E'dena Hines. On August 16, 2015, 33-year-old Hines was murdered in New York City.
Plasma-activated water (PAW) is water that has been treated using cold atmospheric plasma (CAP). Possible uses for PAW include in medical treatments such as wound healing and cancer treatment, along with agriculture processes, from seed germination to crop protection. Additionally, PAW has the potential to replace the use of more toxic chemicals for the elimination of spoilage bacteria in foodstuffs. Other uses have been explored in materials processing, materials synthesis, and analytical chemistry.
== Products and services == Access Control Systems Industrial and Commercial Fire Safety Consumer and Residential Fire Safety Hazard Sensing and Combustion Control Electronic Security Commercial Refrigeration Transport Refrigeration Heating, Ventilating, Air Conditioning Monitoring and Response Physical Security Cash in Transit Security Personnel Intrusion sensors Digital Video
== Techniques == The tools and techniques of ornithology are varied, and new inventions and approaches are quickly incorporated. The techniques may be broadly dealt under the categories of those that are applicable to specimens and those that are used in the field, but the classification is rough and many analysis techniques are usable both in the laboratory and field or may require a combination of field and laboratory techniques.
Approximately 9.4% of diabetes-related ER visits were for the uninsured. Women also have worse experiences with diabetes and care for diabetes than men do. Women experience more mental health issues, like eating disorders, associated with diabetes. Women are also three times more likely to be housebound because of societal pressures put on people with diabetes. Overall, women seek out more medical help, while at the same time receiving less help than men who are the same race and economic class. Transgender people also struggle with diabetes care reporting less preferential treatment than non-transgender people.
Sources: en.wikipedia.org
=== Food products === Naturally occurring melatonin has been reported in foods including tart cherries to about 0.17–13.46 ng/g, bananas, plums, grapes, rice, cereals, herbs, olive oil, wine, and beer. The consumption of milk and sour cherries may improve sleep quality. When birds ingest melatonin-rich plant feed, such as rice, the melatonin binds to melatonin receptors in their brains. When humans consume foods rich in melatonin, such as banana, pineapple, and orange, the blood levels of melatonin increase significantly.
=== Awards === In 2007, British investors evaluated six nominated private companies and chose to Camurus as the best privately owned biotechnology company in the Medicon Valley. The company was awarded the Strictly Financing Award 2007. In 2013, Camurus was awarded CPhI Pharma Award for Best Innovation in Formulation.
=== Adoption by BIPM until 2026 === The IUPAC 1961 definition of the unified atomic mass unit, with that name and symbol "u", was adopted by the International Bureau for Weights and Measures (BIPM) in 1971 as a non-SI unit accepted for use with the SI. From 2026, the BIPM no longer describes it, or other units, as accepted for use with SI; it is listed among a group of "Internationally recognised units that are not decimal multiples or submultiples of SI units".
On 1 September 1983, the Soviet Union shot down Korean Air Lines Flight 007, a Boeing 747 with 269 people aboard, including sitting Congressman Larry McDonald, an action which Reagan characterized as a massacre. The airliner was en route from Anchorage to Seoul but owing to a navigational mistake made by the crew, it flew through Russian prohibited airspace. The Soviet Air Force treated the unidentified aircraft as an intruding U.S. spy plane and destroyed it with air-to-air missiles. The incident increased support for military deployment, overseen by Reagan, which stood in place until the later accords between Reagan and Mikhail Gorbachev. During the early hours of 26 September 1983, the 1983 Soviet nuclear false alarm incident occurred; systems in Serpukhov-15 underwent a glitch that claimed several intercontinental ballistic missiles were heading towards Russia, but officer Stanislav Petrov correctly suspected it was a false alarm, ensuring the Soviets did not respond to the non-existent attack. As such, he has been credited as "the man who saved the world". The Able Archer 83 exercise in November 1983, a realistic simulation of a coordinated NATO nuclear release, was perhaps the most dangerous moment since the Cuban Missile Crisis, as the Soviet leadership feared that a nuclear attack might be imminent. American domestic public concerns about intervening in foreign conflicts persisted from the end of the Vietnam War. The Reagan administration emphasized the use of quick, low-cost counterinsurgency tactics to intervene in foreign conflicts.
Sources: en.wikipedia.org
Dry lyophilized powder tolerates short ambient exposure during handling and shipping. Long-term room-temperature storage is not recommended because moisture uptake and slow degradation can occur over months. Storage at minus twenty degrees Celsius is the common practice for extended periods.
Typical entries list appearance, identity by mass spectrometry, purity by chromatography, water or moisture content, and residual counter-ion. Some certificates also report microbial limits and endotoxin for materials intended for laboratory use. The reported methods and acceptance ranges vary between suppliers.
The peptide is often supplied as an acetate or trifluoroacetate salt, and the counter-ion affects solubility, weight-per-mole calculations, and compatibility with cell assays. Trifluoroacetate can be undesirable in some biological experiments. Knowing the salt form is necessary for accurate concentration determination.
It is a chain of 28 amino acids, with an acetyl group attached to the first serine residue. The synthetic version replicates this sequence. Its molecular mass is about 3,108 daltons.